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y GL W. ZEIGLER.

SOCKET CLAMP FOR SGAPFOLDING, am.

Patented Sept. 29, 1885.

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G. W. Z-EIGLER. SGGKBT GL'AMP POR SGAPFOLD'ING No. 327.427. PatentedS'pt. 2 9; 1885.

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l/ E! J f WITNESSES IJVVEJVTOR UNTTED STATES PATENT OFFICE.

GEORGE V. ZEIGLER,A OF VVASHINGTON,` DISTRICT OF COLUMBIA.

SOCKET-CLAMP FOR SCAFFOLDING, 86C.

SPECIFICATION forming part of Letters Patent No. 327,427, datedSeptember 29, 1885.

Application filed August 7, 1885.

T0 all whom, it may concern:

Be it known that I, GEORGE WV. Zinio-LER, a citizen of the UnitedStates, residing at Vashington, in the District of Columbia, haveinvented certain new and useful' Improvements in Socket-Clamps forTrestling, Scablding, and other Purposes; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable Others skilled in the art to which it appertains tomake and use the same. v

My present invention is au improved metal Socket and clamp for use inthe construction of trestles, scaffolding, and other structures, and isdesigned more particularly as an improvement upon Letters Patent grantedme the 19th day of May, 1885, the same bearing No. 318,154.

The general objects of the invention are similar to those of the LettersPatent referred to, but the present invention involves several featuresof construction by which such objects are attained in a superior manner,it being, however, tributary to or dependent upon the principlecomprised by the rst, yet capable of serving many additional functions.

The invention consists, substantially, in the parts as constructed andin such other details as will hereinafter be distinctly described, andpointed out in the claims.

Referring to the accompanying sheets of drawings, Figure l represents aperspective view of trestling or scaffolding in which my improvementsare embodied. Fig. 2 represents an end elevation in which myimprovements are also embodied. Fig. 8 represents a perspective view ofa modied form of support; Fig. 4, a top or plan view; and Fig. 5represents a view of the socket-clamp in perspective.

By referring to the Patent No. 318,154, hereinbefore mentioned, it willbe observed that the socket or clamp is constructed of two flat andtapering inclined or convergent sides that form the means by which thelegs or supports are received and held. The principal distinction in thepresent instance is that the sides of the clamp are so formed orconstituted `as to present a right angle in transverse section, bywhich, in addition to other features of change hereinafter named, thedesired results are obtained. I desire to state,

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further, that under certain conditions it may be desirable to form thesides of various configurations in cross-section, such as semicircularor, perhaps, of irregular design; and I do not wish to be limited to theform herein shown.

Referencebeing had to the several parts by the letters marked thereon, Arepresents as a whole a socket-clamp in which my invention is embodied,and B B designate the legs or supports, these latter being of contourpreferably as shown, to conform to the construction of the clamp proper,their opposing sides being beveled or chamfered to give them therequisite degree of pitch or inclination.

C represents the ledger or cross beam, and D D designate risers by whicha scaffold or other structure may be run up or built any height desired.

Returning to the socket-clamp, I will proceed to describe itsconstruction in detail.

a a designate the two planes forming each side, which unite with eachother at right angles, each tapering, and the two being convergent orslightly inclined toward each other at the top. At their point ofjuncture at the bottom they terminate in a point, as shown at b, bywhich increased strength of resistance is afforded to outward strain dueto weight imposeduponthesupporting-legs. Theplanes forming the angle ofthe sides extend out to the ends of the lateral ledger-supports c, asshown at d, making a slight curvature, as shown, to avoid abrupt anglesin the formation. The ledger or tie-beam supports c brauch outward atright angles to the main sides, leaving an open or free space between,by which the ends of the legs may enter the angle formed in each of thesides to embrace the ledger.

A strengthening-rib, e, extends crosswise or transversely of the socketfor a like purpose as the webs c in my former patent referred t0.

Preferably at one or more of the curved points d is formed a projectinglug, f, having a perforation by which a strengthening rod or brace maybe employed to connect two or more trestles, or by which articles suchas a hammock or the like may be suspended thereto.

The legs B are beveled at their upper ends, as is understood, and theledger or tie beam ICO is slightly grooved or hollowed out at each ofits sides adjacent to the ends of the legs, as at g, into which groovesthe latter are partially received, thus preventing any possible saggingor dislodgment of parts from strain endwise of the beam.

To attach or erect the risers upon the beam, the clamp is simplyinserted, and the risers then inserted having their outer sides beveledin order to cause them to assume a vertical position, as shown. In thisway the scaffolding may be run up or erected any height re quired.

In Fig. 3 I have shown a modified formof leg or support, the same beingobtained by mortising out a single piece of timber a sufficient distancefrom the end to give the two ends thus formed an elasticity orspringiness by which, when beveled off and placed within the socket,they will be tightly coniined therein. rIhis form of construction,however, is intended more particularly for the risers, and in thisconnection it will readily be seen how a single piece can be made toperform the functions of two.

In order to give the legs an inclination or pitch in the direction oflength of the beam or ledger, I simply bevel the under side of thelatter to the extent required, as indicated between the letters h h,Fig. l, gaining this result without any alteration of the legs or anychange in the clamp.

My invention, it is thought, will be thoroughly understood from theforegoing; but I desire to add that there are many material changeswhich could be made in the construction of the several parts which wouldcome within the scope of my invention.

Having thus described my invention, what I claim is l. In a trestle orscaffold, a clamp consisting of two sockets, each formed of two sides,which are right angled in cross-section, and having lateral supportsextending therefrom, substantially as described.

2. In a trestle or scaffold, a socket-clamp formed in one piece andconsisting of two tapering and convergent right-angled sides havinglateral supports extending therefrom, substantially as described.

3. In a trestle or scaffold, a socket-clamp formed of two pairs oftapering and convergent sides having lateral ledger-supports, each sidevbeing right angled in cross-section, and terminating in a point wherethey intersect at the bottom, and thence extending outward to the endsof said supports, substantially as described.

4. In a trestle or scaffold, a socket-clamp formed of two right-angledsides having lateral supports, as described, and having the perforatedlugs and transverse strengtheningribs, substantially as and for thepurpose set forth.

5. The combination, with the socket-clamp, constructed substantially asdescribed, of the legs or risers conforming to the contour of the clamp,and the ledger or beam formed with grooves in its sides adjacent to saidlegs or risers, substantially as shown, and for the purpose set forth.

6. The combination, with the socketclamp, constructed substantially asdescribed, of the ledger or beam and the legs or risers formed of asingle piece mortised a suitable distance from its ends, and having theportions thus formed beveled or chamfered, substantially as specified.

7. rIhe combination, with the socket-clamp, constructed substantially asdescribed, of the legs or supports having beveled sides or edges, andthe ledger grooved at points adjacent to such legs, and having its underside beveled or chamfered, substantially as and for the purposespecified.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE W'. ZEIGLER.

Witnesses:

E. EVERETT ELLIs, Max LUoHs.

